Fix16.h

00001 #ifndef __FIX16_H__
00002 #define __FIX16_H__
00003 #define FIX_SHIFT   16
00004 
00005 typedef int32_t fix16_t;
00006 
00007 static const fix16_t fix16_one = 1 << FIX_SHIFT;
00008 static const fix16_t fix16_100  = 100 << FIX_SHIFT;
00009 static const fix16_t fix16_half = 0x00008000;
00010 
00011 static inline fix16_t fix16_add(fix16_t x, fix16_t y) { return x + y; }
00012 static inline fix16_t fix16_sub(fix16_t x, fix16_t y) { return x - y; }
00013 static inline fix16_t fix16_mul(fix16_t x, fix16_t y) { return (fix16_t)(((int64_t)x * y) >> FIX_SHIFT); }
00014 static inline fix16_t fix16_div(fix16_t x, fix16_t y) { return (fix16_t)(((int64_t)x << FIX_SHIFT) / y); }
00015 
00016 inline fix16_t fix16_abs(fix16_t value) { return value > 0 ? value : -value; }
00017 
00018 static inline fix16_t fix16_from(int x) { return x << FIX_SHIFT; }
00019 static inline fix16_t fix16_from(float x) { return (fix16_t)(fix16_one * x); }
00020 
00021 static inline int fix16_to_int(fix16_t x) { return x >> FIX_SHIFT; }
00022 static inline float fix16_to_float(fix16_t x) { return (float)x / fix16_one; }
00023 
00024 
00025 
00026 
00027 #endif //__FIX16_H__